In recent years, various preparations and potential biomedical applications of the single-component nanomaterial have been more and more mature.Meanwhile, multi-component nanomaterials, which can be provided with multi-functions or mutually reinforcing functions or functional interaction, have got a lot of attentions.Substantial progress in the size and shape control of magnetic nanomaterials have great potential for biomedical applications, such as drug-target technology, cell separation, immunity analysis, molecular imaging and gene therapy.Silver nanomaterials are very strong light absorbers and light scatterers, a wide variety of applications ranging from plasmonics to sensing, surface enhanced Raman scattering, imaging, and catalysis.In recent years there have been many reports concerning tailor-made syntheses and their applications of Ag/Fe3O4 nanocomposites.